DEPTH FROM DEFOCUS - A SPATIAL DOMAIN APPROACH

Citation
M. Subbarao et G. Surya, DEPTH FROM DEFOCUS - A SPATIAL DOMAIN APPROACH, International journal of computer vision, 13(3), 1994, pp. 271-294
Citations number
29
Categorie Soggetti
Computer Sciences, Special Topics","Computer Science Artificial Intelligence
ISSN journal
09205691
Volume
13
Issue
3
Year of publication
1994
Pages
271 - 294
Database
ISI
SICI code
0920-5691(1994)13:3<271:DFD-AS>2.0.ZU;2-2
Abstract
A new method named STM is described for determining distance of object s and rapid autofocusing of camera systems. STM uses image defocus inf ormation and is based on a new Spatial-Domain Convolution/Deconvolutio n Transform. The method requires only two images taken with different camera parameters such as lens position, focal length, and aperture di ameter. Both images can be arbitrarily blurred and neither of them nee ds to be a focused image. Therefore STM is very fast in comparison wit h Depth-from-Focus methods which search for the lens position or focal length of best focus. The method involves simple local operations and can be easily implemented in parallel to obtain the depth-map of a sc ene. STM has been implemented on an actual camera system named SPARCS. Experiments on the performance of STM and their results on real-world planar objects are presented. The results indicate that the accuracy of STM compares well with Depth-from-Focus methods and is useful in pr actical applications. The utility of the method is demonstrated for ra pid autofocusing of electronic cameras.